Zip-Lining
The act of refusing to completely remove your pants before intercourse, and choosing instead to just pull your dick out through the fly. While unnecessary and ultimately will result in chafing, it is a very common practice.
Example:
Went on a date with Rebecca yesterday, things got hot and heavy fast, didn't even have time to get my pants off, so I was zip-lining her!
Went on a date with Rebecca yesterday, things got hot and heavy fast, didn't even have time to get my pants off, so I was zip-lining her!